Requirements

Features

• marking: possibility to define mark rules based on source node, destination node, transport protocol type and application type
• new schedulers: WFQ, WF2Q+, SCFQ, SFQ, LLQ
• new policy: possibility to define a DSCP based rate limiter
• new monitoring possibilities:
  • For UDP-based traffic
    • Average, instantaneous, minimum and frequency distributed OWD
    • Average, instantaneous, minimum and frequency distributed IPDV
  • For TCP-based traffic
    • TCP Goodput on a DSCP basis
    • TCP Round-Trip Time on a DSCP basis, both instantaneous value and frequency distribution
    • TCP Window Size on a DSCP basis, both instantaneous value and frequency distribution
  • per-hop parameters:
    • Instantaneous and average queue length on a queue basis or on a queue and drop precedence level basis
    • Maximum burstiness for queue 0
    • Departure rate on a queue basis or on a queue and drop level precedence basis
    • Received packets, transmitted packets, dropped packets due to droppers and dropped packets due to buffer overflow, all on a DSCP basis and for both absolute and percentage values

Download and Install

• DiffServ4NS on sourceforge.net
• download and install

Support

Use this forum for support/feedback

Example

This example script shows how to configure a DiffServ router interface and how to gather several monitoring parameters. I strongly suggest you to read my master thesis and check related scripts and results.

Requirements

1. NS2 2.29
2. DiffServ4NS
3. gnuplot

Topology

QoS Traffic Model for E1->C outgoing interface

Script

The example script is included in the DiffServ4NS distribution (see example-2)

Results

Using PQ scheduler

Using LLQ scheduler

PQ for queue 0 and SFQ for the others

Using SCFQ scheduler